Tracing back to development from production

I have a j2ee application that is running on the unix production server. I need to set up a local workstation in my window machine with the folders available on my production server.Its already deployed and up running, so my task is to add some features to the application. The folder structure is

In order to set up the work station I need the java files that was used to create these class files,reorganize them. After which I have create the .war file in order to deploy as a new application. In a situation like this what approach would you people follow. I did see the java files in the work folder. But its all jumbled up, it seems each one does have a package of its own, how do I got about reorganizing the folder structure so that I get an error free development workstation in my eclipse so that I would be free to do some fresh coding.